Thomas aheakn



T. AHEARN.

DRIVING MECHANISM FOR DISK TALKING MACHINES.

APPLICATION FILED MAY 21, ms.

1 ,329,5 1 9, Patented Nov. 4, 1919.

THOMAS AHEABN, 0F OTTAWA, ONTARIO, CANADA.

DRIVING MECHANISM FOR DISK TALKING-MACHINES.

weenie.

Specification of Letters Patent.

Patented Nov. 4L, 1919.

Application filed May 27, 1918. Serial No. 236,809.

To all whom it may concern:

Be it known that I, THOMAS AHnARN, a subject of the King of Great Britam and resident of the city of Ottawa, in the rovince of Ontario, Dominion of Canada, have invented certain new and useful Improvements in Driving Mechanism'for Disk Talking-Machines, of which the following is a specification.

This invention relates to improvements in driving mechanism for disk talking machines, and the objects of the invention are to provide a simple and effective device which will enable a constant speed motor to be used, while permitting desired variation in driving speed.

Further objects are to provide a simple and effective form of speed regulation and to generally improve and simplify the construction of the driving mechanism to enable it to better erform the functions required of it,'and 1t consists essentially of a radial moving driving member adapted to engage the disk carrying member, all as hereinafter more fully set forth and described in the accompanying specification and drawings.

In the drawings,

Figure 1 is a plan view of the disk carrying member partly. broken away.

Fig. 2 is a sectional elevation.

Fig. 3 is a side View.

Fig. 4 is a sectional detail of one of the bearings.

In the drawings, like characters of reference refer to corresponding parts in all the figures.

Referring to the drawings, A represents a casing or frame of the talking machine of suitable size and construction to contain the various working parts, which may be of well known design.

B represents the disk carrying member which in the embodiment illustrated is mounted on the squared end 10 of a spindle 11, which is itself rotatably mounted in a suitable ball bearing 12, the spindle being thus free to rotate with the disk carrying member, the ball bearing being suitably mounted in the casing and in the top plate 13 thereof. 7

0 represents the friction driving member conveniently formed of leather or other material having a relatively high surface friction.

y In the embodiment illustrated, it is mounted on a counter shaft 14 supported from brackets 15 and 16 on the underside of the plate ,13. The shaft 14 extends in a substantially radial direction and the driving member C is slidably mounted on a squared portion 17 thereof being adjusted by suitable means, such as a laterally extending rod 18 slidably mounted in the bracket 16 and having a fork-shaped end 19 to engage in a groove 20 on the hub 21 of the driving member.

The periphery of the driving member is adapted to extend through a suitable aperture 22 formed in the plate 13 and to engage with the underside of the spindle 23 on the disk carrying member D.

To assist in holding the driving member in friction engagement with the disk carrying member, the bearings 40 in the brackets 15 and 16 are provided with guideways 41 in which bearing blocks 42 may move upwardly and downwardly being normally held in uppermost position-by compression springs 43. In uppermost position the driving member is adapted to project above the normal plane of the normal surface of the disk carrying member so that in use the spring 43 will be in slight compression, thereby augmenting the frictional resistance between the driving member and the disk carrying member.

The shaft 14 is suitably driven from a constant speed electric motor E being connected thereto in any convenient way. I have shown a driving pulley 24 on the shaft 14 connected by a belt 25 with a light pulley 26 on the shaft of the motor.

It will be seen that with the motor, constant speed variation is made, the speed of rotation of the disk carrying member may be produced by moving the driving memberinwardly and outwardly in a radial direction.

As many changes could be made in the above construction and many apparently widely different embodiments of my invention within the scope of the claims, constructed withoutdeparting from the spirit or scope thereof, it is intended that all matter contained in the accompanying specification and drawings shall be interpreted as illustrative and not in a limiting sense.

What I claim as my invention is:

1. In a talking machine, a motor plate, a record turntable pivoted thereon; a driving mechanism below said motor plate comprising an electric motor, a radially movable driving wheel frictionally engaging the underside of the turntable, means connecting the motor to the driving wheel, and means for radially shifting the driving wheel to different adjusted positions relatively to the face of the turntable, thereby varying the speed of rotation of said turntable.

2. In a talkin machine, a motor plate, a record turntalfie provided on its underside with a marginal friction surface, a driving mechanism below said motor plate, comprising an electric motor, a radially shiftable driving wheel engaging themarginal friction surface of the turntable, means connecting the motor to the driving wheel, and means for movin the said driving wheel in adjusted positions relatively to the saidmarginal. friction surface toward and away from the center of the turntable to vary the speed of rotation of said turntable, without variation of the speed of the motor.

3. In a talking machine,a motor support,

a record turntable pivotally mounted thereon, a driving mechanism below said motor support com'prlslng an electric motor, a radially mounted counter shaft whose axis is parallel to the face of drivin wheel rotatable with and axially movab e upon the counter shaft, said driving wheel frictionally engaging. the turntable under its marginal edge, means connecting the said motor with the counter shaft, and means for adjustably moving the driving wheel axially on said 1 counter the turntable, a'

shaft toward and away from the center of the turntable whereby the speed of rotation of said turntable may be varied independently of the speed of the motor.

4. In a talking machine, a motor plate,- a record turntable above said motor plate, a driving mechanism below the motor plate, comprising an electric motor, a radially movable driving wheel projecting through an opening in said motor plate and frictionally engaging the under marginal surface of the turntable, means connecting the motor to the driving wheel, means for radially sliding the said drivin wheel in different adjusted positions re atively to the face of the turntable, from-the center thereof and spring actuated means for forcing the said driving wheel into frictional engagement with the turntable.

5. In a talkin machine, a motor plate, a record turntabIe rotatably mounted upon said motor plate, aconstant speed electric I toward and away -motor below said motor plate, downwardly extending brackets under said motor plate, said brackets being provided with guideways, bearing blocks movably secured in said guideways, a radially extending counter shaft journaled in said bearing blocks,

a driving wheel rotatable with and shift- --able along said counter shaft, springs rest- 

